Supplementary Material for: HPA1-29w genotyping and the foundation for the platelet apheresis registry in Jiangsu province of China by MassARRAY spectrometry

Introduction: This study aimed to investigate the allele frequencies of the human platelet antigens HPA-1-29w system in Jiangsu (China) and establish the platelet apheresis registry in blood donors. Methods: HPA genotyping was performed using the MassARRAY iPLEX® platform. Allele and genotype frequencies were estimated by direct counting and tested for Hardy–Weinberg equilibrium. The transfusion mismatch probability was calculated for every HPA specificity. Results: The HPA allele frequencies in the Jiangsu Han population of HPA-1b, -2b, -3b, -4b, -5b, -6b, -11b, -15b, and -21b were 0.0055, 0.0530, 0.4116, 0.0015, 0.0155, 0.0162, 0.0003, 0.5317, and 0.0070, respectively, in which a heterozygote of HPA-11a/b was first detected in China. Only allele a was detected for HPA-7-10w、-12-14w、-16-20w and -22-29w quasi-systems. The highest mismatch rate of HPA genes in 1640 platelet donors was the HPA-15 system, followed by the HPA-3 system with a rate of 37.4% and 36.71%, respectively. Conclusion: China’s largest-scale platelet registry of HPA-1-29w has been explored. The MassARRAY platform may help to found the platelet apheresis registry which would be useful to provide matching platelets and lead to a more accurate, effective, and safe transfusion for patients with platelet therapy.